Re: [Haskell-cafe] How do I get this done in constant mem?

11 Oct 2009

      On Sat, Oct 10, 2009 at 11:11:24PM +0200, Daniel Fischer wrote:
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To: haskell-cafe@haskell.org
From: Daniel Fischer 
Date: Sat, 10 Oct 2009 23:11:24 +0200
Subject: Re: [Haskell-cafe] How do I get this done in constant mem?
Am Samstag 10 Oktober 2009 22:14:38 schrieb mf-hcafe-15c311f0c@etc-network.de:
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On Sat, Oct 10, 2009 at 09:33:52AM -0700, Thomas Hartman wrote:
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To: Luke Palmer 
Cc: mf-hcafe-15c311f0c@etc-network.de, haskell-cafe@haskell.org
From: Thomas Hartman 
Date: Sat, 10 Oct 2009 09:33:52 -0700
Subject: Re: [Haskell-cafe] How do I get this done in constant mem?
...
Yes, you should not do this in IO.  That requires the entire
computation to finish before the result can be used.
Not really the entire computation though... whnf, no?
In that example, yes.  But readFile takes the entire file into a
strict String before it gives you the first Char, right?  (Sorry again
for my misleading code "simplification".)
No, readFile reads the file lazily.
hm?  oh, you are right, now that i fixed all the other problems in my
code readFile isn't a problem any more either...  (-:

(but then how does it know when to close the handle?  gotta go read
the code i guess.)

thanks!
-m

Re: [Haskell-cafe] How do I get this done in constant mem?

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